Question

Criticism is only good when you know about the problem beforehand.

Answer 1

Some criticism is helpful in improving yourself.

Answer 2

I assume this is a true or false question.

False.
Why is criticism needed anyway? Don't we have enough of that already?
We all know, by logic, what hurts others and what may bother them. Criticism is the act of picking on something with the intention of dislike.

If further explanation is needed, just comment below and I'd be glad to assist.